R2C6 can only be <5>
R4C8 can only be <1>
R5C2 can only be <8>
R5C4 can only be <6>
R5C6 can only be <9>
R6C8 can only be <6>
R8C4 can only be <4>
R8C5 can only be <3>
R8C6 can only be <1>
R2C5 can only be <6>
R4C2 can only be <5>
R5C8 can only be <4>
R2C4 can only be <7>
R6C5 can only be <5>
R6C2 can only be <3>
R4C5 can only be <8>
R2C2 is the only square in row 2 that can be <1>
R7C8 is the only square in row 7 that can be <3>
R2C9 is the only square in row 2 that can be <3>
R9C9 is the only square in row 9 that can be <1>
Squares R1C2 and R1C9 in row 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R1C1 - removing <7> from <578> leaving <58>
R1C8 - removing <27> from <2578> leaving <58>
Squares R3C3 and R7C3 in column 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R2C3 - removing <9> from <289> leaving <28>
R8C3 - removing <59> from <2589> leaving <28>
Squares R8C9 and R9C8 in block 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R8C8 - removing <27> from <2579> leaving <59>
Intersection of row 2 with block 3. The value <9> only appears in one or more of squares R2C7, R2C8 and R2C9 of row 2. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
R3C7 - removing <9> from <459> leaving <45>
R3C8 - removing <9> from <579> leaving <57>
Intersection of column 1 with block 7. The value <7> only appears in one or more of squares R7C1, R8C1 and R9C1 of column 1. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.
R8C2 - removing <7> from <2679> leaving <269>
R9C2 - removing <7> from <247> leaving <24>
Squares R1C2 and R9C8 form a remote locked pair. <27> can be removed from any square that is common to their groups.
R9C2 - removing <2> from <24> leaving <4>
R9C1 can only be <7>
R9C8 can only be <2>
R8C9 can only be <7>
R1C9 can only be <2>
R1C2 can only be <7>
R3C2 can only be <9>
R3C3 can only be <5>
R7C2 can only be <6>
R3C7 can only be <4>
R3C8 can only be <7>
R7C3 can only be <9>
R1C1 can only be <8>
R2C7 can only be <9>
R8C2 can only be <2>
R7C7 can only be <5>
R8C8 can only be <9>
R8C3 can only be <8>
R8C1 can only be <5>
R2C3 can only be <2>
R8C7 can only be <6>
R2C8 can only be <8>
R1C8 can only be <5>
R2C1 can only be <4>